Four straight days of competition between two meets for the first time in the series’ nine-year history. Track and field’s established champions — Caster Semenya, Elaine Thompson, Christian Taylor — and rising stars — Noah Lyles, Christian Coleman, Juan Miguel Echevarria — dot the fields in Monaco on Thursday and Friday and London on Saturday and Sunday.

Olympic Channel: Home of Team USA will air live broadcast coverage, streamed on NBC Sports Gold along with additional events and commercial-free feeds.

Women’s Pole Vault — Friday, 1:35 p.m. ETA gathering of the top seven women in the world this year (indoors and outdoors). Though U.S. Olympic silver medalist Sandi Morris won the world indoor title on March 3, London Olympic champion Jenn Suhr and New Zealand’s Eliza McCartney have been the best outdoors this spring and summer.

Women’s 3000m Steeplechase — Friday, 2:35 p.m. ETThe 11 fastest women in the world this year in one of the deepest fields in Diamond League history for any event. The headliners are the top four from the 2017 World Championships — U.S. gold and silver medalists Emma Coburn and Courtney Frerichs and Kenyans Hyvin Kiyeng and Beatrice Chepkoech. Plus, Kenyan Celliphine Chespol, second-fastest all-time in the event. This could be an opportunity for Coburn and Frerichs to chase the 9-minute barrier, which no North American has broken (Coburn’s American record is 9:02.58). Olympic champion and world-record holder Ruth Jebet has not competed since January due to a reported doping issue.

Women’s 100m — Friday, 2:50 p.m. ETMissing the top Americans (world champion Tori Bowie and U.S. champion Aleia Hobbs), but it has most of the international stars. That includes Olympic champion Elaine Thompson, who hasn’t been the same since she was shockingly fifth at 2017 Worlds and hasn’t won a meet outside of Jamaica this year. Marie-Josée Ta Lou of the Ivory Coast, fastest in the world in 2018 at 10.85, has to be the favorite.

Men’s 1500m — Friday, 3 p.m. ETFirst time Olympic champ Matthew Centrowitz faces all three 2017 World medalists — Kenyans Elijah Manangoi and Timothy Cheruiyot and Norwegian Filip Ingebrigtsen — since this meet last year. Cheruiyot crushed Manangoi and Centrowitz in the Bowerman Mile at the Prefontaine Classic on May 26. The 22-year-old has one loss all year, runner-up to Manangoi at the Commonwealth Games, and has the three fastest 1500m times for 2018.

Women’s 800m — Friday, 3:25 p.m. ETCaster Semenya puts her near-three-year win streak on the line against the next seven fastest women this year, including Olympic silver medalist Francine Niyonsaba and world bronze medalist Ajeé Wilson. Semenya broke the South African record at this meet the last two years. She’s already chopped .91 off her national record this year to become the fourth-fastest all-time. She is .97 shy of the 35-year-old world record.

Men’s 200m — Friday, 3:35 p.m. ETU.S. 100m champion Noah Lyles puts his two-year 200m win streak on the line. Challengers include surprise world champion Ramil Guliyev of Turkey, who is 0-3 against Lyles all-time, and Ameer Webb, who won the national title in Lyles’ absence on June 24. Lyles clocked 19.69 seconds in his last two 200m races, tying South African Clarence Munyai (not in the Monaco field) for the fastest time in the world since August 2015. Only six men have broken 19.60 — Usain Bolt, Yohan Blake, Michael Johnson, Walter Dix, Justin Gatlin and Tyson Gay — but none were as young as the 21-year-old Lyles.

Men’s 3000m Steeplechase — Friday, 3:45 p.m. ETAll three world championships medalists and the seven fastest in the world this year. None bigger than Olympic and world champion Conseslus Kipruto, undefeated internationally in 2016 and 2017. Not the case this season. Fellow Kenyan Benjamin Kigen beat him at Pre, and then Kipruto was a shocking 12th in Rabat last Friday. Another chance for Olympic silver medalist Evan Jager to become the first sub-8-minute American. He won in Monaco in 8:01.29 last year.

Men’s 100m — Saturday, 10:50 a.m. ETChristian Coleman, after reasserting his argument as the world’s fastest man, faces another formidable field. U.S. runner-up Ronnie Baker and NCAA champion Cameron Burrell are also here, as is Brit Zharnel Hughes, at 23 arguably the most promising non-American in the world.

Men’s Long Jump — Sunday, 9:31 a.m. ETCuban Juan Miguel Echevarria is the most exciting long jumper in recent memory after nearly jumping out of the pit last month with the world’s best jump in 23 years. The 19-year-old followed that with two best wind-legal jumps in the world this year at his next two meets. He could be pushed even farther here by the last two Olympic champions — Jeff Henderson and the soon-retiring Greg Rutherford — and every 2017 World medalist — Luvo Manyonga, Jarrion Lawson and Rushwahl Samaai.

Women’s 100m Hurdles — Sunday, 10:39 a.m. ETOlympic champion Brianna McNeal, world-record holder Kendra Harrison and fellow American Sharika Nelvis split the last three Diamond League races and split their three head-to-head-to-head meetings this year. A strong win here makes a pretty good argument for best in the world at the moment. McNeal has the top 2018 time of 12.38, but that’s not close to Harrison’s world record of 12.20 from two years ago.

More: Olympics

The 2017 World Track and Field Championships left questions that could carry over into 2019 and 2020. What does Allyson Felix have left? When will Justin Gatlin cede the world’s fastest man title? How much longer will Caster Semenya be unbeatable?

Those questions might not be answered at this weekend’s Prefontaine Classic (NBC and NBC Sports Gold broadcast schedule here), but it could be the most important meet of a year without a world championships to sort them out.

Felix races the 400m, now her trademark event after a decade as mainly a 200m sprinter, for the first time since taking bronze at worlds in London in August. She does so against the women who beat her both at worlds in London and in Rio.

Gatlin withdrew from Pre on Wednesday, but the man now seen as the heir to Usain Bolt‘s sprint throne, Christian Coleman, races the 100m for the first time since worlds, too. Coleman may have been edged by Gatlin in their one-two at worlds, but he is 14 years younger and coming off an indoor season where he ran the 60m faster than the world record three times (twice under legal conditions).

If Coleman stays fast at Pre, through the summer and 2019, we may look back on 2017 as the transition year between the retiring Bolt and rising Coleman more so than Gatlin’s return to the top.

Semenya faces all of her closest 800m rivals on Saturday, though “close” must be used loosely. Her dominance may be impacted going into next season if the IAAF’s new testosterone limits on middle-distance runners are implemented. This Diamond League season presents what could be the final opportunities for American Ajee’ Wilson and others to take on Semenya before the women’s 800m landscape changes significantly.

Women’s 800m — 4:10 p.m. ETOlympic champion Caster Semenya faces the fastest American of all time, Ajee’ Wilson, for the first time since the 2017 Worlds, where Semenya breezed past Wilson and Burundi’s Francine Niyonsaba in the final straight. Semenya is undefeated at 800m for 22 straight meets dating to September 2015, according to Tilastopaja.org.

Men’s 3000m Steeplechase — 4:26 p.m. ETFirst matchup between Olympic and world champion Conseslus Kipruto of Kenya and top American Evan Jager this season, and Jager’s first steeplechase anywhere since Sept. 1. Kipruto relegated Jager to silver at the Olympics and bronze at the world championships. Jager has never won a race with Kipruto in the field but does have the world’s fastest time since the Rio Games.

Women’s 100m — 4:41 p.m. ETThe top five women from the 2017 World Championships, led by gold medalist Tori Bowie and Jamaican Elaine Thompson, who swept the 100m and 200m in Rio but was shockingly fifth at worlds. Thompson suffered her second 100m defeat since the start of 2016 at the Diamond League opener in Doha on May 4. Bowie has been absent from the Diamond League since worlds in August. Marie-Josée Ta Lou and Murielle Ahouré of the Ivory Coast and Dutchwoman Dafne Schippers have a chance here.

Men’s Shot Put — 4:58 p.m. ETEvery reigning Olympic and world medalist is in this field, plus the six men who combined for the world’s 33 best outdoor throws since the start of 2013. It’s headlined by Rio gold and silver medalists Ryan Crouser and Joe Kovacs of the U.S. and New Zealand’s Tomas Walsh, who on March 25 matched the farthest throw in the world since 1990. Crouser defeated Walsh at the Drake Relays on April 28.

Women’s 400m — 5:31 p.m. ETShaune Miller-Uibo led the 2017 Worlds final coming off the last curve but stumbled and ended up fourth with American Phyllis Francis the surprise winner. Pre is the outdoor 400m season debut for Miller-Uibo and Francis. Miller-Uibo has already in 2018 run the fastest times ever for 300m indoors and 150m on a straightaway.

Semenya, the Olympic 800m champion, is entered in the 1500m in Doha against a field lacking any of the other top seven finishers from the 2016 Olympics or 2017 Worlds. Semenya took 1500m bronze at last year’s worlds.

Semenya has not commented publicly on last week’s IAAF announcement that women with high testosterone must reduce those levels by Nov. 1 or will not be allowed in international races between 400m and the mile. South Africa’s Olympic Committee said Semenya, whom track officials mandated undergo gender testing in 2009, is expected to be affected by the ruling.

While Semenya is the standout name in Doha, several other events feature stronger head-to-head matchups, including reigning Olympic and world champions.

Women’s 1500m — 12:13 p.m. ETSemenya has two defeats in about 20 international meets since the start of 2016, according to Tilastopaja.org. It would be a shock if she gets a third here. Semenya owns the two fastest times of the year in her complementary event. None of the other star 1500m runners — like Olympic and world champion Faith Kipyegon (pregnancy), Olympic and world medalist Jenny Simpson (racing the 3000m in Doha)and world-record holder Genzebe Dibaba — are in this field.

Women’s 100m — 12:26 p.m. ETFour of the top five sprinters from the 2017 World Championships, missing only gold medalist Tori Bowie. Watch Olympic champion Elaine Thompson, whose only 100m defeat since the start of 2016 came at the 2017 Worlds. But the Jamaican was fourth this year in the world indoor championships 60m and the Commonwealth Games 200m.

Men’s Javelin — 12:50 p.m. ETProbably the strongest Doha field at the top with the top four from the 2017 World Championships. Germany has the reigning Olympic champion (Thomas Roehler) and world champion (Johannes Vetter), who combined for the top six throws in the world last year. Last year in Doha, Roehler recorded the world’s farthest throw in 20 years, only to see Vetter go farther two months later.

Women’s 100m Hurdles — 1:15 p.m. ETThe five fastest Americans over the last 13 years are in this field — world-record holder Kendra Harrison, 2016 Olympic champion Brianna McNeal, Sharika Nelvis, Jasmin Stowers and 2008 Olympic champion Dawn Harper-Nelson. It’s the third time these five women will race together. McNeal races internationally for the first time since leading a U.S. sweep in Rio and then sitting out all of 2017 for missing three drug tests (though never failing one). Harper-Nelson races for the first time since announcing she will retire at the end of the season. Harrison’s only defeats since the start of 2016 were at the Olympic trials and world championships.

Men’s 200m — 1:36 p.m. ETAn intriguing group including surprise world champion Ramil Guliyev of Turkey, Olympic silver medalist Andre De Grasse of Canada, Olympic 110m hurdles champion Omar McLeod, promising American Noah Lyles and Jereem Richards of Trinidad and Tobago. With Usain Bolt retired and Wayde van Niekerk absent and coming off a knee tear, there is no clear-cut king of the 200m at the moment.